Texas Instruments TPS65170RHDT

Overview

TPS65170RHDT from Texas Instruments is a highly integrated LCD bias power management IC featuring dual DC-DC converters (boost up to 18.5V/2.8A and buck at 3.3V/1.5A), two charge pump controllers (VGH/VGL), reset generator, and gate drive for external high-side MOSFET isolation switch - all in a single 28-pin 5×5 mm QFN package. It delivers complete panel power for large-format LCD TVs and monitors.

For engineers reviewing the TPS65170RHDT datasheet, TPS65170RHDT pinout, TPS65170RHDT application, or TPS65170RHDT equivalent, key selection considerations include its fixed 750kHz switching frequency, programmable boost soft-start, reset pulse duration control, thermal shutdown at 150°C, and compatibility with external transistors for VGH/VGL regulation to minimize on-chip power dissipation.

Technical Context

The TPS65170RHDT integrates a current-mode non-synchronous boost converter (VIN = 8.6–14.7V → VS up to 18.5V) and a fixed-frequency buck converter (VLOGIC = 3.3V ±3%) sharing a common 750kHz oscillator. Its dual charge pump controllers regulate VGH (positive) and VGL (negative) via external transistors using precision feedback references (1.24V for VGH, 0V for VGL).

It implements system-level sequencing: boost output powers display source voltage (VS), buck supplies logic (VLOGIC), and reset generation monitors VLOGIC to assert /RST during power-up. The GD pin provides active-low open-drain gate drive for an external high-side MOSFET isolation switch between VS and the panel, with programmable delay via DLY capacitor.

Key Specifications

Pinout & Package

TPS65170RHDT is housed in a thermally enhanced 28-pin, 5 mm × 5 mm QFN package with exposed thermal die pad (pin 29, connected to system GND). Pin pitch is 0.5 mm; package conforms to JEDEC MO-220 standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD bias power management applications.

Compared with TPS65170RHDT, TPS65171RHDT trades isolation switch control for digital configurability, while MAX17106ETL+ sacrifices VS headroom and buck current capacity to integrate charge pump switches - making TPS65170RHDT optimal for cost-sensitive, high-reliability LCD TV designs needing robust hardware sequencing and external transistor thermal scalability.

Availability

TPS65170RHDT is available at Aetrix Electronics and suitable for LCD TV panels, industrial monitors, and digital signage requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS65170RHDT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management solutions, with over 50 years of innovation in high-reliability power ICs.

The TPS65170RHDT belongs to TI's LCD bias PMIC product line, designed specifically for cost-effective, thermally efficient power delivery to large-format TFT-LCD panels in consumer and industrial displays.

FAQ

What is the maximum output voltage the TPS65170RHDT boost converter can generate?

The TPS65170RHDT boost converter delivers up to 18.5 V at its VS output, measured after the external isolation switch. This is achieved with input voltage between 8.6 V and 14.7 V and is programmable via the FB pin resistor divider. The device maintains regulation across load currents up to 1.5 A with ≤0.1 %/A load regulation, making it suitable for driving source drivers in 32″–65″ LCD panels. TPS65170RHDT supports this performance with a 2.8 A minimum switch current limit and fixed 750 kHz switching frequency.

Does the TPS65170RHDT integrate VGH and VGL regulation, or require external components?

The TPS65170RHDT does not integrate power transistors for VGH or VGL regulation - instead, it provides dedicated CTRLN and CTRLP pins to drive external PNP/NPN transistors or MOSFETs. This architecture moves >90 % of power dissipation off-chip, significantly reducing thermal stress and simplifying PCB thermal design. Each charge pump controller uses precision feedback references (0 V for VGL, 1.24 V for VGH) and supports short-circuit protection modes. TPS65170RHDT thus requires external transistors and passive components but achieves higher reliability and flexibility than fully integrated alternatives.

How does the TPS65170RHDT handle power-up sequencing for LCD panels?

The TPS65170RHDT implements hardware-based power-up sequencing: the buck converter (VLOGIC) starts first upon VIN exceeding UVLO (8.2 V), then the boost converter ramps VS via programmable soft-start (SS pin), followed by activation of the GD pin to turn on the external isolation switch only after VS stabilizes. Finally, the /RST pin asserts low until VLOGIC reaches 3.2 V, ensuring the timing controller resets only after stable logic supply is established. This sequence prevents panel damage from premature VS application and is fully autonomous - no microcontroller or external logic required. TPS65170RHDT executes this flow reliably across –40°C to +85°C.

What protection features are built into the TPS65170RHDT?

The TPS65170RHDT includes comprehensive protection: UVLO (7.8–8.5 V), thermal shutdown (150°C with 10°C hysteresis), boost short-circuit detection (latched if FB < 200 mV for >1.36 ms), buck short-circuit recovery (auto-resume if FBB > 400 mV), and ESD ratings of 700 V (Charged Device Model). Additionally, the GD pin enables controlled isolation switch turn-on to prevent inrush, while the DLY and CRST pins allow capacitor-programmed delays for reset and charge pump timing. All protections operate independently per rail, ensuring fault containment. TPS65170RHDT maintains these safeguards across its full operating temperature and input voltage range.

Can the TPS65170RHDT operate without an external isolation switch?

Yes - the TPS65170RHDT can operate without an external isolation switch, but an external 100 kΩ pull-up resistor from GD to VIN is still mandatory to ensure the open-drain GD pin remains high-impedance and does not float. In such configurations, the GD pin serves no functional purpose, but its proper termination prevents unintended behavior. All other functions - boost, buck, VGH/VGL control, and reset - remain fully operational. TPS65170RHDT retains its full specification compliance, including efficiency, regulation accuracy, and thermal performance, regardless of whether the isolation switch is implemented.